Detect basket arbitrage in a Polymarket neg-risk (mutually-exclusive, multi-outc

Detect basket arbitrage in a Polymarket neg-risk (mutually-exclusive, multi-outcome) event - since a full YES basket across all outcomes always settles to exactly $1, a basket price away from $1 is a near risk-free edge. Also computes buy/sell_basket_capacity_shares, the actual liquidity-bottleneck size executable right now, so this is not just a top-of-book mirage. Polymarket only (Kalshi's Data ToS forbids this use of their data). Paid in USDC on Base.

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Endpoint

GET https://alphapipeline-eu.onrender.com/v1/prediction/neg-risk-arbitrage

Our checks, last 30 days

We never call tools that send, buy, move money or file anything, not even without paying.

Example input (from the provider)

{
  "method": "GET",
  "queryParams": {
    "event_slug": "presidential-election-winner-2028"
  },
  "type": "http"
}

Promised output schema (from the provider)

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "method": {
          "enum": [
            "GET",
            "HEAD",
            "DELETE"
          ],
          "type": "string"
        },
        "queryParams": {
          "properties": {
            "assumed_round_trip_cost_pct": {
              "description": "Estimated all-in cost (Polygon gas for the neg-risk adapter's convert call, taker fees, slippage buffer) as a percentage of $1 basket notional. Defaults to 1.5.",
              "type": "number"
            },
            "event_slug": {
              "description": "Polymarket event slug, from the event's URL on polymarket.com.",
              "type": "string"
            },
            "max_slippage_pct": {
              "description": "How far past each leg's best price to walk the book when sizing executable basket capacity. Defaults to 1.0.",
              "type": "number"
            },
            "min_net_edge_pct": {
              "description": "Minimum net edge (% of $1 basket notional) required to flag arbitrage_viable: true. Defaults to 1.0.",
              "type": "number"
            }
          },
          "required": [
            "event_slug"
          ],
          "type": "object"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "properties": {
            "arbitrage_viable": {
              "title": "Arbitrage Viable",
              "type": "boolean"
            },
            "assumed_round_trip_cost_pct": {
              "title": "Assumed Round Trip Cost Pct",
              "type": "number"
            },
            "basket_ask_sum": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "type": "null"
                }
              ],
              "default": null,
              "title": "Basket Ask Sum"
            },
            "basket_bid_sum": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "type": "null"
                }
              ],
              "default": null,
              "title": "Basket Bid Sum"
            },
            "buy_basket_capacity_notional_usd": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "type": "null"
                }
              ],
              "default": null,
              "title": "Buy Basket Capacity Notional Usd"
            },
            "buy_basket_capacity_shares": {
              "title": "Buy Basket Capacity Shares",
              "type": "number"
            },
            "buy_basket_capacity_vwap_notional_usd": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "type": "null"
                }
              ],
              "default": null,
              "description": "Same capacity as buy_basket_capacity_shares, but priced by walking the actual order-book depth (volume-weighted) instead of using each leg's top-of-book price - a more realistic fill cost than buy_basket_capacity_notional_usd. Null if depth data was insufficient.",
              "title": "Buy Basket Capacity Vwap Notional Usd"
            },
            "buy_basket_gross_edge_usd": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "type": "null"
                }
              ],
              "default": null,
              "title": "Buy Basket Gross Edge Usd"
            },
            "buy_basket_net_edge_usd": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "type": "null"
                }
              ],
              "default": null,
              "title": "Buy Basket Net Edge Usd"
            },
            "data_source": {
              "title": "Data Source",
              "type": "string"
            },
            "event_slug": {
              "title": "Event Slug",
              "type": "string"
            },
            "generated_at": {
              "properties": {
                "kst": {
                  "title": "Kst",
                  "type": "string"
                },
                "utc": {
                  "title": "Utc",
                  "type": "string"
                }
              },
              "required": [
                "utc",
                "kst"
              ],
              "title": "TimestampPair",
              "type": "object"
            },
            "notice": {
              "anyOf": [
                {
                  "type": "string"
                },
                {
                  "type": "null"
                }
              ],
              "default": null,
              "title": "Notice"
            },
            "num_outcomes": {
              "title": "Num Outcomes",
              "type": "integer"
            },
            "oldest_book_snapshot_time": {
              "anyOf": [
                {
                  "properties": {
                    "kst": {
                      "title": "Kst",
                      "type": "string"
                    },
                    "utc": {
                      "title": "Utc",
                      "type": "string"
                    }
                  },
                  "required": [
                    "utc",
                    "kst"
                  ],
                  "title": "TimestampPair",
                  "type": "object"
                },
                {
                 

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